That's .NET Core, which is incompatible with .NET, so it's a completely new ecosystem so it has no where close to the maturity of Java or normal .NET.

It's far from mature, though, even if it's deemed stable. If I was making decisions for some huge enterprise I'd prefer Java since it's been battletested on Linux for decades.

Microsoft doesn't know the meaning of the word cross platform, and never has. The conditionals on their latest cross platform offering do little to repair that image.

They only go far enough to bait and switch you and then after they get you they cut funding for maintenance and the cross platform bits rot away.

This is a downside of any open-source project and is not specific to Microsoft.

.Net Core =/= .Net

And runs on more platforms than Java.

Care to name some of these platforms which Java doesn't run on which .NET supports? I'm having a hard time coming up with even a very short list.

Also, Xamarin makes .NET runnable on Android with their runtime and compile it down for iOS.

.NET Microframework makes it runnable on IoT.

I don't think Android is a good example of a platform which .NET supports which Java doesn't since Java is the primary development language for Android apps...

I'm also pretty sure that embedded Java is widely deployed in IoT applications.

Well , not .NET but almost:

PS4 (MonoGame/Mono) XBox One (.NET Core on the future and MonoGame/Mono)

At least you can run c# code on those platforms. Java though is unlikely to ever happen.

So the "platforms" are 2 game consoles?

Citation needed.